Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 4 - Think and Discuss: 112

Answer

At the top of your jump, your acceleration is $10 \frac{m}{s^{2}}$, directed downward. This is discussed on pages 64-65. At the top, you are at rest and there is no air resistance. The force on you is mg and this is the only force, thus it's the net force. By Newton’s Second Law, the acceleration $a = mg/m = g$.
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